Chair



FIG. 1 is a front view of the new design for a chair;

FIG. 2 is a back view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a right side view thereof, the left side is a mirror image of the right side.

The broken lines in the drawings illustrate portions of the chair that form no part of the claimed design. 

CLAIM The ornamental design for a chair, as shown and described. 